Tractor



FIG. 1 is a top front right side perspective view of a tractor showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a top rear left perspective view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for the tractor, as shown and described. 